README -- contents of ExtData/HEMCO/SAMPLE_BCs 29 Jan 2024 GEOS-Chem Support Team The folders in this directory contain sample boundary condition files that were generated from 4x5 simulations. These are used by the GCST for the GEOS-Chem Classic integration tests. If you plan to run GEOS-Chem nested-grid simulations, you will need to generate your own boundary conditions data. Please see this documentation: geos-chem.readthedocs.io/en/latest/supplemental-guides/nested-grid-guide.html